Which types of impurity is added to a semiconductor material so that it can provide holes?
Correct answer: A. Trivalent
- A. Trivalent
- B. Tetravalent
- C. Pentavalent
- D. Monovalent
Explanation
The correct answer is Trivalent. Trivalent impurities, such as Boron, have three valence electrons. When added to a semiconductor material, they create 'holes' by accepting electrons, leading to the formation of a p-type semiconductor, which is characterized by the presence of holes as majority carriers.Other options are incorrect because tetravalent impurities do not alter the balance of electrons and holes in the semiconductor. Pentavalent impurities add extra electrons rather than creating holes, resulting in an n-type semiconductor. Monovalent impurities are not suitable for semiconductor doping to create holes or electrons.
Last updated
About Electrical Properties of Solids
Electrical properties of solids depend on their band structure, charge carriers and conductivity. The topic compares conductors, insulators and semiconductors, relates resistivity to temperature, and covers intrinsic and extrinsic semiconductors, donor and acceptor impurities, electron and hole conduction, and the formation of p-type and n-type materials.
Practise Physics of Solids
320 free Physics of Solids MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 9 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
Aluminium is a ........
By increasing the temperature, the conductivity of the semiconductor is:
Carbon exists as allotropes, which are different crystalline or molecular forms of the same substance. Graphite and diamond are allotropes of carbon. Diamond is a non-conductor whereas graphite is a good conductor because:
Conductivity of a semiconductor material increases byI. increasing temperature.II. increasing the surface area.III. decreasing the density of charge carriers.IV. doping with small amounts of impurities.
Dark plastic handlers often used on kitchen utensils because: